Value Method is called using putIfAbsent

PutIfAbsentTest.java

package com.craftedbytes.concurrency;

import org.junit.Test;

import java.util.concurrent.ConcurrentHashMap;

/**
 * Created by davidbrimley on 22/11/2016.
 */
public class PutIfAbsentTest {


    @Test
    public void proveValueMethodIsCalledEvenWhenKeyIsPresent() throws Exception {

        ConcurrentHashMap<Integer,String> map = new ConcurrentHashMap<Integer, String>();

        map.put(1,"Existing Value");

        map.putIfAbsent(1,callMethod());

    }

    private String callMethod() throws Exception {
        throw new Exception("Calling the method!!!");
    }


}